A sophisticated bath time procedure for real connoisseur's of hair health. It is the process of shampooing one's head with a shampoo and only a shampoo. Followed by a rinse. Followed by an application of a conditioner. And another rinse.
Bi-pooers know how it is meant to be, and adamantly despise brands such as: Head and Shoulders, AXE (hair products), Old Spice, et al.
Him: Hey your hair looks and smells amazing! What is your secret?
Her: I've been bi-pooing my hair for 24 years. Thanks!
Him: Dang! I use a 2 in 1.
Her: You give me the ick.